Two-piece rivet



Ud.. M 19M.

E. B. STIMPSON Two-PIECE RIVET original Filed sept. 2a'. 1921 IN ENTORPatented et. ll, 1924..

EDWIN B. STIB/EPSON, OF BROOKLYN, NEW YORK, ASSGNOR TO EDWIN B,STIB/EPSON COMPANY, OF BROOKLYN, NEW YORK.

@riginal application filed. September 28, 1921, Serial No. 503,863.Divided and. this application led December 21, 1923.

To all 'whom I? may concern:

Be it known that 1, EDWIN B. S'rrMrsoN, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Two-Piece Rivets. ofwhich the following is a specification.

This invention relates generally to rivet constructions and moreparticularly to rivets of the interengaging double-stud type. Thisapplication is in the nature of a division of my prior applicationSerial No. 503,863, filed sept. 28, 1921.

The invention consists in a pair. of complementary formed rivet membersone of which is a longitudinally slotted or double" pronged stud havingan inclined or sloping surface constituting the closed end of the slot.The other stud member is of a rounded or pin type adapted to enter theslot of the double-pronged unit and to have the end portion of thepindeflected laterally into clinching engagement with the goods. The pinstud is provided with an annular inclined shoulder formed to deflectoutwardly in opposite directions the end portions of the prongs of' theslotted or double-pronged rivet member.

In the drawings, in which a preferredl form of the invention has beenselected for illustration,

Figure 1 is a compound view shown in plan and in side elevation andrepresenting a pin type rivet member embodying part of the invention.

Figure 2 is a view in side elevation and partly broken away of theimproved rivet construction in assembled or set condition.

Figure 3 is a view in side elevation of the rivet shown in Figure 2taken at right angles thereto.

Figure 4 is a view in cross-section taken on the lines 44 of Figure 3.

Referring to the drawings for a more detailed description of theinvention, a. twopart rivet structure is shown which includes a splitrivet stud member 10 and a cooperating pin rivet stud member 11, the twostud members being so formed and related to each other that they can bepressed into mutual engagement to provide a double anchoring orclinching effect in the material in which the rivet is set.

This useful effect is obtained by so form- Serial No. 681,969.

ing the interengaging stud end portions as to cause them to bendlaterally into clinchingl engagement with the material through a cammingor diverting action produced by the engagement of the rivet studs witheach other. For this purpose each stud is provided with an obliquedirecting portion which is arranged to be engaged by the end portion ofthe other stud member.

The directing or clinch forming portion of the split stud member 10resides in an oblique or diagonally formed area 12 which constitutes thebase or closed end of the slot 13 which produces the split stud effect.The diagonal wall thus formed is arranged to be engaged by the taperedend portion 14 of the pin stud 11 is indicated in Figure 2 of thedrawing for the purpose of diverting the tapered end portion 14laterally as indicated in this figure. It will be seen that the lateralprojection of the end portion 14 of the pin stud 11 beyond the side wallof the double or split stud 10 provides an anchor which` prevents the4withdrawal of the pin stud from its seat in the material in which ithas been placed.` v

A similar effect is produced with the other rivet stud member 10 by theprovision of a sloping or oblique shoulder portion 15 at the junction ofthe rounded and reduced pinv portion 16 of the pin stud 11 with thelarger main body portion of the stud. This rounded shoulder portionserves to divert the end portions 17 of the split stud 10 into outwardlycurved position such as is shown in Figure 3 of the drawing. It will beseen that this curved or hooked condition of the end portions 17 of thesplit stud 10 provides an exceedingly effective anchorage which preventsthe pulling of the split stud 10 from its position in the material.

It will be seen that with the construction described the pin stud member11 is forced into the slot of the split stud member 10 until the endportion 14 of the pin stud is deflected laterally against the slopingshoulder or end 12 of the split stud member 10 while at the same timethe end portions 17 of the split stud member engage and are deflectedoutwardly by the annular in clined shoulder 15 at the base of the pinportion of the stud 11. It will be Seen that the anchorage effected bythe lateral projection of the end portion 14 of the pin los lstud plusthe oppositel lateral projection of the end portionsfl-T ofv the prongslof the g Spia @lala in le eeeeave as prevean are" puning of the studmembers from their position., yPre:terably 4 the diameter off the pinportion 16J of the stud fl is substantially the same as thespaceseparating the prongs of the split stud l()v so that in additionto" y the anchoring effect referred to the adhaving. a yshank'longitiidinally slotted'v t'o yprovide dou-ble prongs, the4 closedi endof :vantageof: y.the f-i-ctional1 engagement ofE the two studs With eachother isf obtained tostill further increase the anchoring eil'ectproduced` It ivill'k bie clear that in practice the head portionsI 18and 19 of the rivet membjersare brought into engagement with theopp-ositef outer faces of the sheets of' 1nater-ialy which are lieldltogether by the use of the rivet struct-ureI described;

1 Whatl cl-aim'is:-

gli.y Af tivo-piece" rivet comprising a stud f the slotbeing'. inclined*With relation' tb the 'receivedI in` the slot' of the l stud and to haveits end deliected laterally provide dbuble'prong the closed*` end of theslot"bei1lg inclinedy With relation' to' the `longitudina'laxisl of theshank, and a stud having? afroundedL p-infshan-lwith a tapered endportion, said s'hanli being formed tobe double prongedl by engagementwith the inclined closed end of tjlieslot S1-A* tivo-piece" rivetcbxpising" a stud having a. shank longitudinallyT slotted to providedouble p1o11gs,-tlie closedk end of the slot being inclined Withrelation to the longitudinal aXis of the shank, and a stud having apin-shaped shank adapted to be received in the slot o the double-prongedstud; saidf pin-shaped shankbeing provided with an annular inclinedshoulder for delecting the end portions of the double prongs outwardly.

4. A tvvopiecev rivet comprising a stud having al shankl`llongitudinally slotted' to provide double prongs, the closed en'd of theslot being inclined with relatibn tothe longitudinal axisl'of the shank,and a coin'- plemen-tary studf having al rounded pin shank:y with avpointed end' and' an annular shoulder adjacent thev base of the shank'.

5. A tvvo'piecev rivet coniprisin`-` a` stud having a" sha-nklongitudinally sl ttd to provide double prongs; the closed end of ltheslot being inclined with relation t'o the longitudinal mils' of' theshank, a stud having al rounded pin shankl vvith' a" tapered endportion',A said shanl'r being formed tot be received inl the slot of thedouble pronged stud and to have its endl deflectedlaterally byengageme'ntl Witll the inclined olbsed' end off the slot, and'` saidpinlsha-ped shankl beingprovided' with' an annular inclined shoulder fordeliecting the end portions of the double prongs outwardly. K

In testimonyvvheleolf1 Ialixl my sig-natiiro.

EDWIN B; srrinrsolvA

